Solving Equations with 2 Variables
Learn how equations with two variables work, like , and how to find solutions using substitution and graphs. Let's get started! 🚀
Video Lesson
Watch and learn the basics
Flashcards
Review key concepts visually
%20Equations%20with%202%20Variables.webp)
%20Solving%20Equation%20with%202%20variables.webp)
%20Solving%20Equations%20with%202%20Variables%20Graphically.webp)
🛎️ Equations with Two Variables
- An equation like x + 2y = 20 has two unknowns.
- There are many solutions because lots of number pairs can work.
🛎️ Solving by Substitution
- Substitute the value you know into the equation to solve for the other variable.
- For example, if x = 10, substitute it in x + 2y = 20 to get 10 + 2y = 20. Solving for y, we get y = 5.
🛎️ Solving Graphically
- Rewrite the equation x + 2y = 20 as y = −0.5x + 10 to draw the line.
- This means every point on the line is a solution to the equation.
- The point (8, 6) is a solution because it lies on the line.
Practice Questions
Test your understanding
Interactive Activity
Solving equations with 2 variables
Loading interactive widget...
Click here to open ChatCat